Light Emitting Device Columnar Portion Segmentation
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Solution Overview
Problem
Current semiconductor light emitting devices with nanostructures face challenges in reducing the lasing threshold value and achieving high-power light emission at a narrow radiation angle, as they require optimization of the nanostructure design to enhance light confinement and reduce strain in the light emitting layer.
Innovation Solution
A light emitting device is designed with a laminated structure comprising columnar portions, where the first columnar portions function as active light emitting layers and the second columnar portions have a higher resistance and do not emit light, positioned to overlap and not overlap with the peak electric field intensity, respectively, to create an optical confinement mode and reduce the lasing threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a nanostructure with columnar portions is used to achieve high-power light emission at a narrow radiation angle, then light confinement is improved, but the lasing threshold value increases
Solution Approach 1:
The columnar portions are divided into first columnar portions (with light emitting layers) and second columnar portions (without light emitting layers). This segmentation allows the light emitting regions to be optimized for light confinement while the non-light emitting regions help reduce the overall lasing threshold value, resolving the contradiction between achieving high light emission intensity and maintaining a low lasing threshold.
Solution Approach 2:
Different regions of the columnar portions are assigned different functions: first columnar portions contain light emitting layers for light generation and confinement, while second columnar portions exclude light emitting layers to reduce threshold. This local differentiation optimizes both light emission intensity and lasing threshold simultaneously.
2Power
If the light emitting layer is expanded to increase light output, then light emission power is improved, but strain in the light emitting layer increases
Solution Approach 1:
By segmenting the columnar portions into first and second types, the light emitting layer is distributed only in specific regions rather than continuously expanded. This allows light emission power to be increased through multiple discrete sources while each individual light emitting layer maintains optimal thickness and strain characteristics.
Solution Approach 2:
The solution transitions from expanding the light emitting layer in one dimension (area) to distributing multiple light emitting layers across different columnar portions in a spatial arrangement. This dimensional redistribution increases total light output while maintaining acceptable strain levels in each layer.
3Speed
If the radiation angle is narrowed to improve beam directionality, then beam quality is improved, but light confinement requirements increase
Solution Approach 1:
The columnar portions are segmented into first and second types with alternating arrangement. This segmentation creates a periodic structure that provides inherent optical confinement through the contrast between light emitting and non-light emitting regions, achieving narrow beam angle without requiring additional complex confinement structures.
Solution Approach 2:
The light confinement function is merged with the structural arrangement of alternating first and second columnar portions. The periodic pattern itself provides the confinement mechanism, eliminating the need for separate complex confinement structures and simplifying the overall device design while maintaining narrow beam directionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for efficient light amplification and reduced lasing threshold values by aligning the light emitting layer with peak electric field intensity, while minimizing strain and light absorption, thereby enhancing the device's performance.
Implementation Method 1
the first columnar portion has a light emitting layer into which a current is injected to generate light
Implementation Method 2
an optical confinement mode is formed in the plurality of columnar portion groups
Data Source
AI summary
There is provided a light emitting device including: a substrate; and a laminated structure provided on the substrate and having a plurality of columnar portion groups, in which the columnar portion group includes at least one first columnar portion, and a plurality of second columnar portions, the first columnar portion has a light emitting layer into which a current is injected to generate light, no current is injected into the second columnar portion, an optical confinement mode is formed in the plurality of columnar portion groups, the first columnar portion is disposed at a position that overlaps a peak of electric field intensity, and the second columnar portion is disposed at a position that does not overlap the peak of electric field intensity.